The knowledge of Ancient Vedic Men was of such high degree, the customs they popularized and inbred among the people in their daily lives was of high scientific and logical nature. A highly scientific marvel like Aum is remodeled to be an important religious symbol, while the Gods are attributed with Vahanas akin to their individual divinities. It is but very obvious then, that the places where the Gods reside, the temples are deemed to be resplendent of similar scientific and symbolic imagery, which not only appeals to the devotee's sub-conscious, but also helps him meditate peacefully.
The Architecture-The location and The Garbhagraha:
It is a mighty known fact that most of the ancient temples were designed to be more than mere places of worship and meditation. The Vedic temples were built strategically in places where the positive cosmic energy is in abundance because of the magnetic and electric fields.
The main idol is always located in the core center of the temple, known as the Garbha-Griha. As a matter of fact, first the idol is placed in its position and then the temple is built around it. The Garbha-griha is chosen to be the place where magnetic waves are the strongest. As a practice, some copper plates, inscribed with Vedic Shlokas are kept beneath the main idol. Copper absorbs the magnetic energy and radiates positive energy to the surroundings. This specific attribute of copper makes it useful in curing arthritis by wearing it in bracelets.
As a person revolves around the main idol in a clockwise direction, he receives the positive energy radiated from the copper, and this, gradually helps him, in meditation and maintain a good health on a regular visit. In a way, the temples were designed as "Public charging sites".
The pyramidal shape:
The particular pyramid shape of these temples serves manifold purposes. However hot or humid the entire surroundings may be, one could never feel hot inside a temple. A tall, gradually narrowing structure, along with water being poured all across the floors keeps the inside of the temple premises cool, and the magnetic fields stronger(heat reduces magnetic energy).
In the year 2005, an article was published in the Indian Journal of Traditional Knowledge. A group of scientists in Bangalore took containers of various shapes and placed various food items in it. As days passed, it was observed that the container which was pyramidal in shape demonstrated the slowest decay out of all the containers.
Various temples use flowers to further keep the atmosphere inside light and comfortable, to negate the effects of moistness. These flowers and fruits get decomposed as slowly as possible because of the pyramidal structure.
As per the legends, the bell sound is to ward off evil forces away. A well designed bell, if struck, produces long strains of AUM.
Symbolically, the body of the bell represents time. The tongue of the bell represents Saraswati. Striking the bell would mean the message of Saraswati, which is knowledge and wisdom itself, being spread all over.
Scientifically, a temple bell is made up of a variety of metals, just in the correct proportion. When struck properly, a bell sound lasts for at least seven seconds, and touches the seven healing centers, or the Chakras in the body. It also unites the left and the right part of the brain. As soon as one hears the bell, all pre-thoughts are emptied, or in a way, it wakes one up before entering the temple itself.
The bells also don't allow any insect to remain inside the temple. The reason, why even the oldest of temples won't have any insects or pests inside them.
Throughout history Tibet and India have shared ancient knowledge, and it is possible - but unproven - that the first Rite could also have been influenced by the practice of Pradakshina.
In Hinduism, Pradakshina means the act of worshipful circumambulation (walking clockwise around a holy temple, shrine, or place). Dakshina means right, so you walk to the left, keeping the spiritual object on your right.
To perform Pradakshina you walk clockwise around a temple, sacred object, person, mountain, place or even oneself. Hindu temples are designed with special passages, so that people can perform these clockwise movements around them.
The purpose of this clockwise circling is to center or purify oneself, or to honor or bond with the object of devotion.
Circumambulation is so common in fact that it can be found in the Greek, Roman, Druid and Hindu cultures. Usually it had to do with sacrifice or purification processes. Interestingly, in all these cultures the direction was always the same - clockwise!
Another inseparable ingredient of any Vedic temple, Dhwaja or, the Flag, serves purposes more than mere symbolisms of a number of legends. The color of the dhwaja, red or orange, symbolizes the fierce energy of the sun. As the flag flutters, thanks to its very peculiar spear shape, it symbolizes sun's life-giving glow. As the flag flutters, it also symbolizes great wisdom and bravery togetherness.
Scientifically, the flag acts as a conductor to transfer the energy from within the Garbha Griha to the entire atmosphere, thus radiating positive energy all across. It also acts as a lightning rod which saves the temple structure from lightning.
As per the legends, the pillar holding the Dhwaja, the Dhwaja-stambh represents as a connect between heavens and earth. The stambha symbolizes the Holy Trinity, Brahma, Vishnu and Mahesh. The flag, when seen by a devotee from a distance, informs him about the deity being worshipped within the temple and sometimes, even the rituals are symbolized by the Dhwaja.
The ingredients of worship:
Let's take a step back from here, i e. The temple premises, and have a look at what's all happening inside the temple. Even under scorching sun and intense heat, the insides of the temple are still pretty cool. Water is being sprayed continuously and devotees are lighting up incense sticks, striking bells, and offering flowers to the deity. Lamps are lit all over, which emit talismanic low light. Add to that the positive vibes which are already present all around.
All these ingredients of a 'perfect' worship create a state of trance, where from the point a devotee enters the premise, he enters into a state of trance and is almost hypnotized in the entire settings of the temple. His mind is now singularly focussed on devotion, and the body is absorbing positive energy. According to the very scientific Vedas, this is the state of trance when a man himself becomes God. Its only then, it is said, that one could build a temple in his heart and can meditate without even needing one temple.
It's not necessary that each and every older temple of India has been built keeping the same concepts and ideologies in mind as stated above, but every temple that's based on Vedic notions, follows the same architecture and model as stated by the Vedic principles